is it possible to take a client copy with everything EXCEPT transaction data ???
You can copy the client using SAP_CUST profile for Customizing data, and afterwards make another copy with SAP_USER for the Master User data.
I remember there was an option in previous SAP version to create your own profile (so you can use just that one with whatever options you choose) but I dont see it anymore.
Anyways, a 'mix' copy with different profiles can help you...